media: atomisp: comment an unused code

There's a different table for some BYT variants that depend
on something inside a FIXME ifdef.

Place this also inside it, just to shut up a clang-11 warning.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>